My first hand shower was a prize I won in a Hansgrohe contest. It offered exceptional functionality, but mostly it sat hanging on my shower arm unused. Then I had back surgery and it became a critical item during my recovery.
I could sit on my shower bench, and my wife could easily help me shower with the hand shower hose’s reach. For me, it is an important reason to have a hand shower. If you have back, knee, or hip surgery, or whatever it may be where your mobility is seriously hampered, it is a big help.